Organize your site, your work and give your visitors and friends the ability to do the same! This easy to use application runs on Unix and Windows-based machines. Written in Perl, it works great wherever you need it, only make sure that your Perl version is 5.6 or higher. Remember that Plans requires a host that can execute perl cgi scripts. Perl is available on machines running Windows, through a free program called ActivePerl.
Some of the features are: browser-based management, multiple calendars, recurring events, international support, database support, sharp looking, open source, extendable, template-based design and more!